Physics, Chemistry and Biology: Post your doubts here!

[AAnsarii]

ne seriously difficult ppr in chem dat n av. prsn will find hard, plz post it here.
thanks

 

[imperial]

omg nearly 30 minuts have pased and no one solvd my 1 mark question

 

[AAnsarii]

omg nearly 30 minuts have pased and no one solvd my 1 mark question

ive got d same query after lookin

 

[AAnsarii]

HELP !!! PLEASE Q6. part b, http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w04_qp_3.pdf

remove H 4m acid(both sides) n OH 4m alcohol.

 

[AAnsarii]

www.xtremepapers.com/spapers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w10_qp_33.pdf
5b (iv)

please help me in the past quetsion too

EDIT: they r just 1 mark and 2 mark question shodnt take long

one n 2 mk qns decide ur grade...

 

[aliqamar1995]

remove H 4m acid(both sides) n OH 4m alcohol.

JazakAllah man ! Thanks

 

[AAnsarii]

JazakAllah man ! Thanks

wa iyyakum

 

[imperial]

one n 2 mk qns decide ur grade...

1 mark question is more confusing sooo..

 

[AAnsarii]

1 mark question is more confusing sooo..

which 1?
ne particularly difficult pprs , plz tell. tx

 

[imperial]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w10_qp_33.pdf
3c (iv) WHY THE V IS 0.6 EXACTLY? HOW DO WE KNOW THE EXACT VALUE? I KNOW IT SHOULD BE BETWEEN BUT THE MARK SCHEME SAYS 0.6

it's 1 mark because i know one half, but the other no

 

[AAnsarii]

it's 1 mark because i know one half, but the other no

just guess, i think

 

[imperial]

just guess, i think

but the mark scheme clearly say 0.6, how they figurd it out

 

[Moi]

remove H 4m acid(both sides) n OH 4m alcohol.

you mean remove OH from acid and H from Alcohol

 

[AAnsarii]

you mean remove OH from acid and H from Alcohol

really, no, y do dat?
lyk acid donates H+ ions, rite? plz reply asap, n thx

 

[EpicLol]

ohh ok thank u both soo much

This thing? ~ lol zigzag.... XD

 

[Manobilly]

I spent like 10 mins making a nice drawing
Hope it helps XD

For question 7 b ii

Thanx.

 

[Manobilly]

Hi, had a doubt in chemistry
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w10_qp_33.pdf
question 5b (iv) Need a diagram to understand

 

[fishcook]

but the mark scheme clearly say 0.6, how they figurd it out

because you know that tin is more reactive than copper and its cell produces a voltage of 0.5 and a zinc and copper cell produces a voltage of 1.1.
so a zinc and tin will produce 1.1-0.5=0.6 voltage

 

[imperial]

because you know that tin is more reactive than copper and its cell produces a voltage of 0.5 and a zinc and copper cell produces a voltage of 1.1.
so a zinc and tin will produce 1.1-0.5=0.6 voltage

AWESOME MAN !!!!!!!!!!!!! THANKS ALOT

 

[fishcook]

Hi, had a doubt in chemistry
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w10_qp_33.pdf
question 5b (iv) Need a diagram to understand

cant be bothered to draw it, but you just have to draw 2 functional groups of -COOH.
hope it helps